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Publication numberUS925122 A
Publication typeGrant
Publication dateJun 15, 1909
Filing dateApr 2, 1909
Priority dateApr 2, 1909
Publication numberUS 925122 A, US 925122A, US-A-925122, US925122 A, US925122A
InventorsGiulio Merlonetti
Original AssigneeGiulio Merlonetti
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 925122 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




'925, 1 22. Patented June 15, 1909.



To all whom it may concern:

Be it known that l, GIULIO MERLONETTI, a subject of the KingI of Italy, residing in West Chester', Pennsylvania, have invented certain lmprovements in Locks, of which the following is a speciiication.

One object of my invention is to provide a relatively simple form of padlock so designed that it cannot be unlocked by any device other than a key of predetermined design.

It is further desired that the parts of the lock shall be so arranged that the key, in being moved to release the hasp, necessarily carries with it a movable member so de signed as to prevent the access to the bolt of any structure other than the key; this member being so constructed as to be auto-v matically held from moving in case it should be attempted to operate it without the proper key.

l further desire to provide a padlock with a bolt oi novel form so arranged as to permit of the use of a relatively simple construction of key for its operation.

These objects and other advantageous ends l secure as hereinafter set forth, reference being had to the accompanying drawings, in which :M

Figure l, is a perspective view of a padlock and its key, constructed according to my invention Figs. 2, 8 and 4 are front elevations of my padlock with the cover removed, and illustrating the construction and operation of the various parts; Figs. 5 and 6 are perspective views oi certain of the detail parts oi the invention; Fig. 7, is a perspective view of a modified form oi padlock; Figs. 8 and 9 are iront elevations illustratino the detail construction and operation of the lock shown in Fig. 7, Fig. lO, is a transverse vertical section on the line 2-2, Fig. 2, and Fig. l1, is a fragmentary plan illustrating the construction of another form of the invention.

Referring to Figs. l to and l0 of the above drawings, A represents one part of the lock casing and A the other part thereof; the two being so constructed that when held together by rivets a, a and a2 they form a flat, substantially cylindrical container. The rivet a2 serves as a pivot Yfor one end ot a hasp B whose other end projects into the casing of the lock formed by the parts A and A and Specification of Letters Patent.

Application filed April 2, 1909.

Patented .Tune 15, 1909.

Serial No. 487,564.

is hooked or recessed so as to receive the end oi' a slidable bolt C.

The hooked end of the hasp is at all times acted on by one end of a flat spring b so that it tends to move outoi the casing, while the bolt C is acted upon by a spring c so that it is normally maintained in position to engage and hold the hooked end oi the hasp B.

Said bolt is guided between the outer Wall of the part A of the casing and a pair of projecting lugs c spaced apart and has av rojecting arm c2 extending between saidl ugs which thereby serve to limit the amount of longitudinal movement of said bolt.

A guiding pin d is permanently fastened to the center of the part A of the casing and projects into the key hole opening a3 of the part A so as to be flush with the outside surface oi' Y said part. ln the present instance this opening is the shape of a dumb bell and is designed for the lreception of a key e having a tubular shank whose bit e terminates in a tubular or hollowcylindrical and c2 ot such shape as to 'lit into the key A carriage D is mounted within the casing of the lock so as to turn upon the guiding pin d as a spindle, and consists of a circular back plate d rigidly connected to a similarly shaped front plate d2 by means of a number of pins d3.

The edge of the back plate d is provided with a number of teeth formed by recesses d4, d5 and d preferably placed 90 apart and the various structures are so proportioned that the arm c2 of the bolt C projects between the front and back plates d and d2. rIhe front plate d2 has in it a dumb bell shaped opening d which, when the parts are in their normal positions, is immediately back of and registers with the opening a3 in the part A of the casing.

In addition to the pins or posts d3, l provide a pin d8, mounted on the back plate d and projecting into the outer enlarged part of the dumb bell shaped opening d? in the front plate, and it will be noted that the guiding pid d projects through the other enlarged portion of said opening.

Mounted upon the rivet c is a curved plate F of spring material, embracing the carriage D; it being preferably formed of a piece of flat spring steel, one arm of which extends in one direction from the rivet c and carries an inwardly projecting linger f lying between the front and back plates d and cl2 of the carriage D. This arm has also an abrupt inwardly projecting end forming a tooth f3, 5 and it will be noted from Fig. 6, that the inner end of the finger f is inclined or beveled, as indicated at f4 in such manner that it is engaged by the portion c of the key bit when this latter is entered in the lock prior lo to the operation thereof. The second arm of this locking piece F has its ends split in such manner that one branch may be bent on itself as indicated at f to form a rounded abutment, while the other is turned abruptly inward to form a second tooth which is practically at right angles to the body of said arm, as indicated at f2, and capable of enter ing certain of the recesses in the back plate d to limit or prevent revolutionv of the carriage.

i 2O Normally the tooth f3 enters the notch d of the back plate of the carriage B so as to effectually prevent its movement in one direction, While the second tooth f2 on the other branch of the locking piece F similarly enters the recess d4 so as to prevent movement of the carriage in the other direction. Under operating conditions, however, the forcing of the key into the lock casing through the two openings a3 and d? causes longitudinal movement of the inger f by its engagement with the beveled end thereof, and a consequent outward movement of its end of the locking piece F, with the result that the tooth f3 is moved out of the recess du. It is l then possible to turn the key E, and with it the carriage D, in the direction indicated by the arrow Fig. 2, with the object ofreleasing the hooked end of the hasp. When the key has been revolved almost 90, its cylindrical portion c2 strikes the rounded or gradually curved end f of the locking piece F, and acting upon it as a cam, forces it outwardly so that it is possible to continue the revolution of the carriage D without the tooth f 2 falling into the recess d5. It is obvious that even if the said carriage be released from its normal position by a false key, it can be turned only to an angle of about 90o, for in the absence of a key having the properly proportioned cylindrical part c2, the tooth f2 necessarily enters the recess d5 and prevents further forward turning of the carriage. Finally, when the key and the carriage have been turned through an angle of almost 90 the cylindrical end e2 of the key bit strikes the stem c2 of the bolt C and forces the latter to move longitudinally against the spring c so as to cause it to release the hooked end of the hasp B. This latter is then free to move to its open position under the action of the spring b. Upon returning the key and with it the carriage D to their normal positions, it is possible to remove the key from the casing, and at any time the hooked end of the hasp may be again yentered into its opening in the casing where it will be held in the locked position by the spring actuated bolt C whose end is properly beveled to permit of the entrance of the hooked end of said hasp.

The particular form of bolt employed by me may be used in a lock constructed as shown in Figs. 7 to 9 inclusive, where as before, the padlock casing is provided with a centrally placed guiding pin d for the reception of the tubular end of a key E. Said key has a transversely slotted bit e3 which is also longitudinally notched; there being a correspondingly formed hole a4 in the casing A2. Within said casing is mounted a plate G having an elevated portion or ward g projecting toward the guide spindle d at such a distance from the back of the casing that when the key is properly entered andy turned, said Ward venters the slot c4 therein and per mits such revolution. In this instance, also, the bolt C is provided with a projecting stem c2 which, as shown in Fig. 9, is designed to be engaged by the end of the'key bit when the key has been turned a sufficient distance.

Movement of the bolt under the action of the key is resisted by a spring c4 which tends to hold it in the position indicated in Fig. 8, in which it engages the hasp B to maintain it in its closed or locked position. In this instance the hasp is acted on by a spring t es which engages a projecting arm b4 as long as said hasp is closed so as to tend to move it into its open position. r{"he end of the hasp is so formed that when it reaches its ful open position, as shown in Fig. 9, the spring b3 tends to hold it from further movement.

In the form of the invention shown in Fig. 1l, the carriage D may be made with two guide pins d8 on opposite sides of the central ain d and with a double dumb bell shaped liole d in the top plate of the carriage for the reception of a correspondingly shaped double bitted key (not shown). In this oase the back plate of 'the carriage has four notches 900 apart and both arms of the locking piece F are provided with curved and slightly inclined end ortions f in addition to the teeth f2 andjfa. These inclined parts are both designed to be moved outwardly by the key when this is inserted and said teeth 11. thereby caused to disengage the back plate of the carriage.

I claim 1. The combination in a lock, of a casing, a carriage therein capable of being turned by a key, and formed by two parallel plates rigidly connected to eachother, a bolt having a portion extending between said plates, and locking means for the carriage capable of being released by the key.

2. The combination in a lock, of a casing, a carriage capable of being turned by the key, and consisting of two rigidly connected plates spaced apart, a bolt having an arm eX- tending between said plates of the carriage,

so as to be engaged by a key after the carriage has been turned a predetermined distance, and means for automatically locking the carriage against movement in the absence of the key.

3. The combination in a lock, of a casing, a bolt, a revoluble carriage capable of being turned by the key so as to permit said key to operate the bolt, an automatic paWl placed to engage and lock said carriage in the absence of the key, after it has been moved a deiinite distance from its normal position,

l. The combination in a lock, of a casing, a bolt, a revoluble carriage placed to receive a key and capable of being turned thereby into a position to permit said key to operate the bolt, means released by the key for holding said carriage in its normal position, and means for locking said carriage in the absence of the key after it has been moved from its normal position.

5. rlhe combination in a lock, of a casing, a bolt therein, a carriage revolubly mounted in the casing and including a plate having a peripheral recess or recesses, a paWl or pawls mounted in the casing and capable of entering said recess or recesses to lock the carriage, said paivl or pa-Wls being placed to be released by the key.

G. The combination in a lock, of a casing having a carriage consisting oi two rigidly connected plates, means for revolubly supporting sain plates, a bolt having an arm eX- tending between the plates, with a spring panel capable of holding the plates from movement and placed to be acted on by a key when the carriage is turned thereby so as to be rendered inoperative.

7. The combination in a lock of a casing', a hasp pivoted at one end to the casing' and projecting into the same at the other end, a T-shaped bolt capable of engaging the second end of the hasp to lock'the same, a spring acting on the stem ofthe bolt and tending to force it into its locking position, and a revoluble carriage for the reception of the key placed to permit the bit of the key to engage the stem of the bolt When said key is turned.

8. The combination in a lock of a casing having a hasp, a bolt in the casing capable of engaging the hasp to lock it, a carriage revolubly mounted in the casing and provided With recesses, a pair of s ring pawls mounted in the casing and capa le of entering the recesses, and a key capable of engaging said pawls to cause them to release the carlriage and also capable of actuating the bo t.

9. The combination in a lock, of a casing, a revoluble carriage therein, having a recess, a spring paWl having an inclined ringer and also having a tooth capable of entering said recess to hold the carriage, and a bolt capable of being actuated from a key after the carriage has been turned to a predetermined distance, said inclined finger being placed to be moved by the key When it is placed in the lock, so as to cause the pawl to move out of the recess ofthe carriage.

In testimony whereof, I have signed my name to this speciiication, in the presence of tWo subscribing Witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4391111 *Jun 12, 1981Jul 5, 1983Waterbury Companies, Inc.Latching mechanism for dispenser apparatus
US5493884 *Oct 26, 1994Feb 27, 1996Bks GmbhKey for locking cylinders, particularly for locking systems
Cooperative ClassificationE05B67/10